To provide a descaling nozzle capable of properly solving the problem of scale remaining (the problem of a lap part) in a place (the lap part) where a descaling water flow flows in a collision area of an adjacent descaling nozzle, after colliding with a rolled material from the descaling nozzle, when removing (descaling) a scale of the rolled material, in a hot rolling line for manufacturing a hot rolled steel material (such as a hot rolled steel belt, a thick plate and bar steel.)

In the descaling nozzle 10, an inlet of the nozzle is formed as a plurality of pipes (a circular cross-sectional flow passage) 11, and an outlet of the nozzle is formed as a slit (a slit-like flow passage) 12 connected to the plurality of pipes (the circular cross-sectional flow passage) 11.